| dc.description.abstract | In this thesis, we design and synthesize four kinds of dyes with Benzothiadiazoloquinoxaline(BTQ) for p-type DSSCs, which are respectively ER99, ER110, ER100, and ER105. And, we expect these new BTQ dyes could have near infrared absorption by inserting the strong electron withdrawing group, BTQ.
The below is a simple introduction of the molecular structures. First, using triphenylamine as electron donor and thiophene as π-conjugated spacer is the common part of these four kinds of BTQ dyes. Second, for ER99 and ER110, 2-dicyanomethane is as electron withdrawing and BTQ is as auxiliary electron withdrawing group. However, for ER100 and ER105, we use BTQ itself as electron withdrawing group by its intrinsic good ability to withdraw electrons. Third, dianchoring group is applied on ER99 and ER100, and monoanchoring group is used on ER105 and ER110.
We also do the UV-Vis absorption spectrum, fluorescence excitation emission spectrum, cyclic voltammetry ,etc., to test the characteristics of the BTQ dyes. Last, we use these four BTQ dyes to manufacture the p-type DSSCs, and we test the efficiency of the devices under AM 1.5 irradiation（100 mW/cm2）as simulated sunlight.
Our results show that ER99 has the best photon to current efficiency, η = 0.0216%（Jsc = 0.361 mA/cm2, Voc = 120 mV, ff = 0.368）. | en_US |